PEDIATRICS Vol. 103 No. 4 April 1999, p. e48
ELECTRONIC ARTICLE:
Lack of Vancomycin-associated Nephrotoxicity in Newborn Infants:
A Case-Control Study
Received Jul 27, 1998; accepted Nov 10, 1998.
,
,
From the * Department of Pharmacy and the College of Pharmacy
and the
Department of Pediatrics and Communicable Diseases,
University of Michigan Health Systems, Ann Arbor, Michigan; and the
§ Department of Pharmacy, University of Kentucky Medical Center,
Lexington, Kentucky.
Objective. The purpose of this study was
to compare the incidence of nephrotoxicity, defined as doubling of
baseline serum creatinine concentration, in newborn infants with peak
vancomycin serum concentrations
40 µg/mL at steady state to infants
with peak vancomycin serum concentrations >40 µg/mL. A secondary
objective was to correlate concomitant disease states and potentially
nephrotoxic drug therapy with rises in serum creatinine in vancomycin
recipients.
Methods. Newborn infants with culture-proven
Staphylococcus aureus or coagulase-negative
staphylococcal septicemia who received vancomycin therapy for >3 days
between 1985 and 1995 were identified from an existing database and a
review of medical record. All 69 patients included in the study had
serial serum creatinine determinations, including a baseline value
within 48 hours of starting treatment with vancomycin, and serum
vancomycin concentrations determined after at least three doses, with
peak and trough concentrations determined 1 hour after a 60-minute
infusion and 15 to 30 minutes before a dose, respectively. Infants with
congenital renal or cardiac anomalies were excluded. Demographic
characteristics, vancomycin dosing regimen, serum vancomycin
concentrations and sample times, concomitant drug therapy, and disease
states were recorded. Patients were divided into group A (peak
vancomycin concentration
40 µg/mL) and group B (peak vancomycin
concentration >40 µg/mL). The change in serum creatinine
concentration between the start and end of vancomycin therapy was
determined. Nephrotoxicity was identified if serum creatinine doubled
at any time from the start to the end of vancomycin therapy.
Alternative definitions of nephrotoxicity (any rise in serum creatinine
to >0.6 mg/dL or new abnormalities of urine sediment) were used in
additional analyses.
Results. A total of 69 evaluable patients (gestational age, 28.9 ± 3.0 weeks; birth weight, 1219 ± 516 g) were identified, 61 in group A and 8 in group B. Six patients in group A underwent doubling of serum creatinine concentration during vancomycin therapy, whereas none in group B did so. Serum creatinine doubled to >0.6 mg/dL in only 3 infants (all in group A). Any increase in serum creatinine to >0.6 mg/dL was seen in 10 infants, 9 of whom were in group A. No confounding variable, including previous or concomitant underlying disease states associated with renal dysfunction or treatment with other potentially nephrotoxic agents, were associated with a significant rise in serum creatinine.
Conclusion. Vancomycin-associated nephrotoxicity is rare in neonates, even with serum peak concentrations >40 µg/mL. Key words: vancomycin, nephrotoxicity, newborn infants, NICU, Staphylococci, creatinine, renal, antibiotics.
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